Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1996-06-13
1998-06-23
Hampton-Hightower, P.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528322, 528332, 526281, 525 66, 525148, 525149, 525184, 525210, 525211, 524504, 524518, 524522, 524523, 524553, 524600, 524606, C08L 7706, C08L 7908
Patent
active
057706794
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The utilization of polyamide resin compositions in fields such as household electronics and outer automobile parts has led to demands for compositions with improved malleability and toughness, excellent rigidity, a high heat deformation temperature, and little warping after molding.
Various methods of improving the toughness of polyamides have been proposed (British Patent No. 998,439, U.S. Pat. Nos. 3,845,163, 3,383,186, 3,465,059, 3,668,274, and Japanese Kokoku Patent No. Sho 55-44108). Among them, the polyamide resin composition disclosed in Kokoku Patent No. Sho 55-44108 is essentially composed of from 60 to 99% by weight of one phase that contains a polyamide matrix resin with a number mean molecular weight of at least 5000 and from 1 to 40% by weight of at least one other phase that contains at least one type of polymer particles selected from the group composed of branched chain and straight chain polymers, that has a particle diameter ranging from 0.01 to 1.0 micron .mu.m, and has parts that adhere to said polyamide matrix resin. The at least one type of polymer is defined by a specific formula and has a tensile modulus ranging from approximately 1.0 to 20,000 psi (0.075-1410 kg/cm.sup.2). The ratio of the tensile modulus of the polyamide matrix resin and the tensile modulus of the at least one type of polymer is higher than 10:1. The at least one type of polymer occupies at least 20% by weight of the aforementioned at least one type of other phase. The composition has improved malleability and toughness.
The rigidity is sometimes unsatisfactory in polyamide resin compositions that have improved malleability and toughness as described above. As such, polyamide resin compositions reinforced for rigidity by adding glass fibers or minerals have been used in the mentioned fields.
The specific gravity becomes too high in polyamide resin compositions reinforced by glass fibers and minerals when used in automobile wheel covers, etc. Problems also arise in terms of dimensional stability because the molded goods warp when resin compositions reinforced by glass fibers are used.
The present invention takes note of these deficiencies and has as its object to propose a polyamide resin composition with improved rigidity under high temperature and humidity, a high heat deformation temperature, and a low molding shrinkage rate while maintaining the malleability and toughness of conventional polyamide resin compositions.
SUMMARY OF THE INVENTION
The present invention relates to polyamide resin compositions exhibiting excellent malleability, toughness, and rigidity under high temperature and moisture humidity. These compositions also exhibit a low molding shrinkage rate and a high heat deformation temperature. Further, the present invention relates to a process for producing the polyamide resin compositions described herein.
The polyamide resin compositions are prepared from 10 to 89% by weight of a polyamide resin, 1 to 30% by weight of at least one type of elastomer selected from among elastomers composed of ethylene/propylene/dienes, elastomers composed of ethylene/unsaturated carboxylic acid/unsaturated carboxylic acid esters, and elastomers obtained by graft-modifying these elastomers, and from 10 to 60% by weight of a copolymer of ethylene and cyclic olefin that is noncrystalline and has a glass transition temperature of from 100.degree. to 190.degree. C.
DETAILED DESCRIPTIONOF THE INVENTION
A first embodiment of the present invention consists essentially of group consisting of carboxylic acid esters, said elastomers having unsaturated monomers which are reactive with, and graft-modifiable to, at least one other monomer or polymer present, acid/unsaturated carboxylic acid esters, and copolymer of ethylene and olefin, said noncrystalline polyolefin having a cyclic structure and a glass transition temperature of from 100.degree. to 190.degree. C.
A second embodiment of the present invention is characterized by containing, in addition to components (A) through (C), from 0.01 to
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Hayashi Ryuichi
Koshida Reiko
E. I. Du Pont de Nemours and Company
Hampton-Hightower P.
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